| substitute(noun, adjective, agent, representative, alternative) |
| alternate(noun, adjective, lower, copy, inferior) |
| stand-in(noun, adjective, cover, reserve, substitute) |
| reserve(noun, adjective, support, increase, lower) |
| support(noun, adjective, help, increase, praise) |
| backing(noun, support, help, praise, benefit) |
| relief(noun, adjective, support, help, praise) |
| surrogate(noun, person, thing, agent, substitute) |
| understudy(noun, adjective, reserve, substitute, replacement) |
| alternative(noun, adjective, spare, extra, substitute) |
| auxiliary(noun, adjective, support, increase, lower) |
| deputy(noun, adjective, help, aid, reserve) |
| replacement(noun, adjective, reserve, extra, agent) |
| spare(noun, adjective, support, reserve, extra) |
| fill-in(noun, adjective, copy, reserve, substitute) |
| patronage(noun, support, help, benefit, aid) |
| secondary(noun, adjective, support, increase, spare) |
| supportive(adjective, informal, spare, reserve, secondary) |
| backup man(noun, expression, idiom) |
| double(noun, adjective, reserve, substitute, replacement) |